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VRML Interactive Tutorial
Introduction
VRML File Structure
Drawing: Shape node
Geometry Nodes:
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Box
Sphere Cone Cylinder PointSet IndexedLineSet IndexedFaceSet Extrusion ElevationGrid Example: Chessboard Text FontStyle |
| Material
Textures
Texture Transform |
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Directional Light
Point Light Spot Light |
Hierarchical Node Structures
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Group
Transform Collision Anchor Billboard Switch |
Defining and Instancing Nodes
Defining Levels of Detail
Events in VRML
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Creating Paths between events:
ROUTE
Generating Events based on Timers or User Actions
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Color
Coordinate Normal Orientation Position Scalar Example |
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Sound
AudioClip |
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Who Am I: NavigationInfo
Where Am I: ViewPoint |
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Background
Fog |
| WorldInfo |
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Coordinate
Color Normal |
Lighthouse3d.com
Mostly about 3D graphics
PointLight Node
If you're new to lighting in VRML, there is a Lighting section in this tutorial which discusses general features of lighting in VRML. In here only the aspects which are particular to Point Lights are discussed.
Point Lights define a light source in a specified location. The light rays from this type of lights go in all directions. This implies that, as opposed to Directional Lights, Point Lights have a location but not a direction field. The following figure attempts to define a Point Light graphically (the point where the light rays start is the light location.
This light lits all nodes regardless of their position in the file, i.e. this light is not scoped. There is however a way of limiting the volume which is lit by this light, one can specify a radius which defines the maximum distance that the light rays can travel. Objects which are further away from the light source than the radius are not lit by the light source.
There is still another way to control the attenuation within the sphere defined by the radius. Using the attenuation field one can specify how the light grows dimmer with distance, within the sphere defined by the radius.
The following fields are present in this node:
Syntax:
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Note: On the VRML world presented as example the sphere is placed at -2.5 0 0, the cone is placed at the origin, and the cylinder is placed at 2.5 0 0. If you're not familiar with placing shapes other than at the origin see the Transform node.
